BY Press Release | April 9, 2021 In total, 4,970 wells were measured across Nebraska last spring, and there was an average increase of 1.58 feet in them statewide. Groundwater levels rose significantly across most of Nebraska from January 2019 to January 2020, and the state received so much precipitation over that period that a new color was added to the 2019-20 precipitation map included in the recently released 2020 Nebraska Groundwater-Level Monitoring Report. âWe ran out of blues, so we had to go to purple,â said Aaron Young, a geologist with the University of NebraskaâLincolnâs School of Natural Resources and lead author of the report.